[Process] Update Semantic Conventions

[martincostello]

• Fixes ResourceDetector.Process - implement other resources #1515
• Contributes to Stable release of OpenTelemetry.Instrumentation.Process #2186

Changes

• Update semantic conventions version to v1.43.0.
• Promote to release candidate. (see [process] Promote Process to RC semantic-conventions#3758)

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.40%. Comparing base (1b4fa04) to head (5fc7c1e).
⚠️ Report is 18 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4675   +/-   ##
=======================================
  Coverage   77.40%   77.40%           
=======================================
  Files         466      466           
  Lines       19687    19687           
=======================================
  Hits        15239    15239           
  Misses       4448     4448           

Flag	Coverage Δ
unittests-Instrumentation.Process	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...elemetry.Instrumentation.Process/ProcessMetrics.cs	100.00% <100.00%> (ø)

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[Copilot]

Pull request overview

Updates the Process-related components to align with OpenTelemetry semantic conventions v1.43.0 and promotes the packages’ documented stability to “Release candidate”.

Changes:

• Bumped OpenTelemetry.Instrumentation.Process semantic conventions version constant to 1.43.0.
• Updated READMEs to reflect “Release candidate” stability and updated the instrumentation README’s semantic conventions link to v1.43.0.
• Added changelog entries noting the semantic conventions update and release-candidate promotion.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/OpenTelemetry.Resources.Process/README.md	Updates stability badge to “Release candidate”.
src/OpenTelemetry.Resources.Process/CHANGELOG.md	Adds an Unreleased entry for semantic conventions update / RC promotion.
src/OpenTelemetry.Instrumentation.Process/README.md	Updates stability to “Release candidate” and bumps semantic conventions doc link to v1.43.0.
src/OpenTelemetry.Instrumentation.Process/ProcessMetrics.cs	Updates SemanticConventionsVersion to 1.43.0.
src/OpenTelemetry.Instrumentation.Process/CHANGELOG.md	Adds an Unreleased entry for semantic conventions update / RC promotion.

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